## UPD: I was wrong :(↵
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Hello everyone,<br>↵
I see that many people complain about copied problems. Their claim is that authors weren't able to come up with some problems, and decided to copy them from other sources instead.↵
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<spoiler summary="Comments of last round">↵
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</spoiler>↵
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Although a contest shouldn't have already used problems, please convince yourself that no problemsetter would copy problems deliberately. The presence of some problems from the Internet is accidental. So, it's not correct to accuse the authors to "copy" the problems.↵
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FAQ:↵
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Q. The statement is completely the same, isn't it obvious that the problem was copied?<br>↵
A. No. Proof: I invented [problem:844C] and [problem:1088D], **with the same statement**. Usually, if you want to write the statement formally, there is only one way that's much more convenient to use that the others.↵
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Q. Maybe you remembered the statement because you had already read it without solving the problem?<br>↵
A. No. Proof: I invented [problem:1501C] and [arc130_d](https://atcoder.jp/contests/arc130/tasks/arc130_d) **before the contest**.↵
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Q. How is it possible that no author / tester was able to find the "copied" problem by googling?<br>↵
A. Challenge: find [arc115_e](https://atcoder.jp/contests/arc115/tasks/arc115_e) on Google, using only the statement of [problem:1591F].
↵
Hello everyone,<br>↵
I see that many people complain about copied problems. Their claim is that authors weren't able to come up with some problems, and decided to copy them from other sources instead.↵
↵
<spoiler summary="Comments of last round">↵
↵
</spoiler>↵
↵
Although a contest shouldn't have already used problems, please convince yourself that no problemsetter would copy problems deliberately. The presence of some problems from the Internet is accidental. So, it's not correct to accuse the authors to "copy" the problems.↵
↵
FAQ:↵
↵
Q. The statement is completely the same, isn't it obvious that the problem was copied?<br>↵
A. No. Proof: I invented [problem:844C] and [problem:1088D], **with the same statement**. Usually, if you want to write the statement formally, there is only one way that's much more convenient to use that the others.↵
↵
Q. Maybe you remembered the statement because you had already read it without solving the problem?<br>↵
A. No. Proof: I invented [problem:1501C] and [arc130_d](https://atcoder.jp/contests/arc130/tasks/arc130_d) **before the contest**.↵
↵
Q. How is it possible that no author / tester was able to find the "copied" problem by googling?<br>↵
A. Challenge: find [arc115_e](https://atcoder.jp/contests/arc115/tasks/arc115_e) on Google, using only the statement of [problem:1591F].
